Weighted Style Photogrammetric Markers

Image-based scene diagramming made easy with Weighted Style Markers

Weighted-style photogrammetry markers Designed and sold by DeChant Consulting Services (DCS) Inc., Weighted Style Markers assist in measuring feature points of interest, and also assist in fast & accurate camera orientation in iWitness. Weighted-Style Markers are used by law enforcement investigators across N. America. Several examples are presented on this website where law enforcement (LE) have successfully used them for crash scene mapping.  The combination of photogrammetric markers, and a digital camera affords very rapid and safe image-based mapping at the incident scene.

Below are a few ‘real-world’ police mapping examples of the DCS Weighted Style Markers used for traffic homicide investigations. The white dots and alpha and numeric characters are double-sided and semi-automatically centroid-marked using either iWitness or iWitnessPRO software systems.

Police mapping of a serious crash scene with DCS weighted-stlye photogrammetry markers

Overturned vehicle mapping with iWitness – van final rest in a creek.

Police Crash Scene mapping at night with DCS Weighted-Style photogrammetry markers

Motorcycle fatality involving a semi truck mapped at night

DCS weighted-style markers in a rolling tool bagThe weighted style markers work well in conjunction with the iWitness target offset feature, which enables the 3D measured point to be automatically projected in the Z-axis up/down direction (e.g., to the ground surface were they were placed.) Optionally, line connected XYZ projected coordinate(s) can then be exported to CAD in DXF format. The Weighted Style Markers also work excellent in combination with the FMT’s and Cone Style Markers.

Storage and Deployment
The weighted markers are designed to stack in a small container for easy storage in the trunk of a vehicle. There is ‘no fuss’ in access, deployment or storage of the weighted markers, which are also rugged to support long-term use and weather resistant. The attached galvanized weights and sand bags affords stability in strong and gusting winds.

Specially designed for the iWitness photogrammetry software system
The weighted style markers are made from a 6mm thick closed-cell PVC, with the target dots and A-to-T letter identifiers being of a special Lexan decal material protected with a clear UV blocking agent, making them weather resistant and virtually scratch proof. An additional five “dot markers”  are supplied, made from 3mm thick plastic and furnished with sand bag weights provided in the set. The galvanized weights are supplied with a special hook and loop Velcro, for the A-T style markers.

Functionality and Options Available
The weighted style markers can be used in both daytime and night scene mapping applications. Using the advanced project stitching (3D transformation to control) or the Project Linking feature available in iWitness or iWitnessPRO, police have proven the application has worked excellent on crash scene mapping projects covering 1000’ in overall length. The combination of weighted style markers, a moderately priced consumer-grade camera and iWitness, the user is fully equipped and ready for low cost, rapid and accurate 3D photogrammetric scene mapping.

A standard set consists of 20 Weighted style markers (letters A to T) that includes a quantity of five dot markers, (supplied with sand bags for weighting).


Please Contact Us for pricing and payment options.

A quantity of 20 weighted markers and 5 sand bag weighted markers complete a set.

Purchasing (domestic):
The weighted style photogrammetric markers are shipped in special packaging anywhere within the USA for $489.00, and shipping fees.

Purchasing (international):
Please use our Contact Us for pricing and shipping options.